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You searched for: subject:"Carbides"
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[texts]Cemented-carbide tools; carbides and bonding agents used for metal cutting, the design, care and maintenance of tipped tools - Shute, D. H
14
Keywords: Carbides; Tools
Downloads: 1,599
[texts]Method of infusion extraction - NON
Apparatus and method of removing desirable constituents from an infusible material by infusion extraction, where a piston operating in a first chamber draws a solvent into the first chamber where it may be heated, and then moves the heated solvent into a second chamber containing the infusible material, and where infusion extraction takes place. The piston then moves the solvent containing the extract through a filter into the first chamber, leaving the extraction residue in the second chamber.
Keywords: COATING; SILICON CARBIDES; PATENTS
Downloads: 112
[texts]Properties of non-stoichiometric metallic carbides final report - Lewis, R. K.
Properties of nonstoichiometric metallic carbides
Keywords: CARBIDES; STOICHIOMETRY; CARBIDE; STOICHIOMETRY
Downloads: 84
[texts]Reaction between Polyol-Esters and Phosphate Esters in the Presence of Metal Carbides
The reaction of metal carbides with polyol esters found in aerospace lubricants and phosphate esters commonly used as additives was investigated. Carbides were of particular interest since modern materials under consideration at high temperature bearings have surfaces that are primarily metal carbides. Vanadium and chromium carbide were found to react with the ester and phosphate ester by a transesterification reaction, producing an alkyl phosphate which is less stable than the aromatic phosphat...
Keywords: Synthetic Lubricant; Additives; Metal Carbides
Downloads: 30
[texts]Character of the interaction of zirconium dioxide with titanium, niobium, and chromium carbides - Fedorus, V. B.
Interaction of zirconium dioxide with titanium, niobium, and chromium carbides
Keywords: CHROMIUM CARBIDES; ZIRCONIUM OXIDE; DIOXIDES; NIOBIUM CARBIDES; TITANIUM CARBIDES; ZIRCONIUM; ZIRCONIUM OXIDES; CHROMIUM CARBIDE; NIOBIUM CARBIDE; TITANIUM CARBIDE
Downloads: 79
[texts]Vaporization of tantalum-carbide - hafnium- carbide solid solutions at 2500 deg to 3000 deg k - Deadmore, D. L
Vaporization of tantalum carbide-hafnium carbide solid solutions at high temperatures
Keywords: CARBIDES; VAPORIZATION; ELECTROSTATIC PROBES; HAFNIUM CARBIDES; HIGH TEMPERATURE; SOLID SOLUTIONS; TANTALUM CARBIDES; VAPORIZING; HAFNIUM CARBIDE; TANTALUM CARBIDE
Downloads: 126
[texts]Lectures delivered at the celebration of the twentieth anniversary of the foundation of Clark University, under the auspices of the Department of Physics - Clark University (Worcester, Mass.)
Volterra, V. Sur quelques progrès récents de la physique mathématique.--Rutherford, E. History of the alpha rays from radioactive substances.--Wood, R. W. The optical properties of metallic vapors.--Barus, C. Physical properties of the iron carbides
Keywords: Physics; Mathematical physics; Radioactivity; Vapors; Carbides
Downloads: 509
[texts]The electric furnace - Moissan, Henri, 1852-1907
Book digitized by Google from the library of Harvard University and uploaded to the Internet Archive by user tpb.
Keywords: Electric furnaces; Chemistry, Inorganic; Carbides; Diamonds
Downloads: 282
[texts]Hot-pressing mixed carbides of tantalum, hafnium, and zirconium - Fischer, J. J
Effect of variations in time, temperature, and pressure on density & grain size in hot pressing of hafnium-tantalum-zirconium carbides
Keywords: CARBIDES; ZIRCONIUM; ZIRCONIUM CARBIDES; HAFNIUM CARBIDE; HOT PRESSING; TANTALUM CARBIDE; ZIRCONIUM CARBIDE; GRAIN SIZE; HAFNIUM; HAFNIUM CARBIDES; HOT PRESSING; TANTALUM; TANTALUM CARBIDES; TIME DEPENDENCE; TIME TEMPERATURE PARAMETER
Downloads: 109
[texts]The electric furnace - Moissan, Henri, 1852-1907
Book digitized by Google from the library of the University of Wisconsin - Madison and uploaded to the Internet Archive by user tpb.
Keywords: Electric furnaces; Chemistry, Inorganic; Carbides; Diamonds
Downloads: 186
[texts]Lectures delivered at the celebration of the twentieth anniversary of the foundation of Clark University, under the auspices of the Department of Physics - Clark University (Worcester, Mass.)
The metadata below describe the original scanning. Follow the "All Files: HTTP" link in the "View the book" box to the left to find XML files that contain more metadata about the original images and the derived formats (OCR results, PDF etc.). See also the What is the directory structure for the texts? FAQ for information about file content and naming conventions.
Keywords: Physics; Mathematical physics; Radioactivity; Vapors; Carbides
Downloads: 287
[texts]The electric furnace - Moissan, Henri, 1852-1907

Keywords: Electric furnaces; Chemistry, Inorganic; Carbides; Diamonds
Downloads: 822
[texts]Le four électrique - Moissan, Henri, 1852-1907
"Bibliographie des travaux de M. Moissan sur le four électrique": p. [347]-376
Keywords: Electric furnaces; Chemistry, Inorganic; Carbides; Diamonds
Downloads: 125
[texts]Method of Testing and Predicting Failures of Electronic Mechanical Systems - Iverson, David L.
A method employing a knowledge base of human expertise comprising a reliability model analysis implemented for diagnostic routines is disclosed. The reliability analysis comprises digraph models that determine target events created by hardware failures human actions, and other factors affecting the system operation. The reliability analysis contains a wealth of human expertise information that is used to build automatic diagnostic routines and which provides a knowledge base that can be used to ...
Keywords: COMBUSTION SYNTHESIS; TEMPERATURE EFFECTS; BORON CARBIDES; ADIABATIC CONDITIONS; COMPOSITE MATERIALS; FILLERS; THERMODYNAMICS; CHEMICAL REACTIONS; SILICON CARBIDES
Downloads: 69
[texts]Spontaneous transition of sliding friction to rolling friction in the high-temperature testing of refractory carbides (spontannyy perekhod treniya skol'zheniya v treniye kacheniya pri vysokotemperaturnykh ispytaniyakh tugoplavikh karbidov) - Pozdnyakov, V. V.
Spontaneous transition of sliding friction to rolling friction with refractory vanadium and molybdenum carbides at high temperatures
Keywords: CARBIDES; MOLYBDENUM COMPOUND; REFRACTORY MATERIAL; ROLLING CONTACT; SLIDING FRICTION; VANADIUM CARBIDE; HIGH TEMPERATURE; MOLYBDENUM CARBIDES; MOLYBDENUM COMPOUNDS; REFRACTORIES; REFRACTORY MATERIALS; ROLLING CONTACT LOADS; SLIDING FRICTION; VANADIUM CARBIDES
Downloads: 66
[texts]Study of the growth parameters involved in synthesizing boron carbide filaments first quarterly report - Cree, R.
Growth and mechanical properties of boron carbide filaments
Keywords: BORON CARBIDES; FILAMENTS; MECHANICAL PROPERTIES; BORON CARBIDE; FILAMENT
Downloads: 57
[texts]On the Wing: A Business-Class Jet - NON
Cessna Aircraft Company was last featured in Spinoff 1991 for the Citation Jet, the industry's current best selling business jet. The newest addition to its fleet is the Citation X (ten), the largest, most complex aircraft ever produced by Cessna, which also has its basis in NASA technology. Aerodynamic design, wind tunneling testing, and airfoil performance, for example, have their foundation with NASA...
Keywords: BORON NITRIDES; MICROSTRUCTURE; CERAMIC MATRIX COMPOSITES; DEGRADATION; SILICON CARBIDES
Downloads: 100
[texts]Properties of non-stoichiometric metallic carbides quarterly progress report no. 3 - Lewis, R. K.
Thermal expansion measurement of pure sintered carbide specimens
Keywords: CARBIDES; EXTENSOMETERS; SINTERING; THERMAL EXPANSION; METAL CARBIDE; THERMAL EXPANSION
Downloads: 56
[texts]PRELIMINARY INVESTIGATION OF THE FABRICATION AND PROPERTIES OF HAFNIUM CARBIDE - Creagh, J. R.
Hafnium carbide - properties and fabrication
Keywords: FABRICATION; HAFNIUM CARBIDES; MECHANICAL PROPERTIES; PREPARATION; HAFNIUM CARBIDE; MECHANICAL PROPERTY
Downloads: 205
[texts]Preparation of ti, zr, nb, and ta solid solu- tions with hf carbide, and a study of their physical properties (polucheniye i issledovaniye fizicheskikh svoystv tverdykh rastvorov karbidov ti, zr, nb, ta s karbidom hf) - Paderno, V. N.
Preparation and physical properties of Ti, Zr, and Nb, and Ta solid solutions with hafnium carbide - alloys of isomorphic carbides of transition metals of groups IV and V
Keywords: CARBIDES; SOLID SUSPENSION; TRANSITION ELEMENT; HAFNIUM CARBIDES; ISOMORPHISM; PHYSICAL PROPERTIES; SOLID SOLUTIONS; SOLID SUSPENSIONS; TRANSITION METALS; CARBIDE; PHYSICAL PROPERTY
Downloads: 63
[texts]Properties of non-stoichiometric metallic carbides quarterly progress report no. 2 - Lewis, R. K.
Physical and mechanical properties studied in preparing nonstoichiometric metal carbides - titanium carbide
Keywords: CARBIDES; PHYSICAL PROPERTY; STOICHIOMETRY; TITANIUM CARBIDE; MAGNETIC PROPERTIES; MECHANICAL PROPERTIES; PHYSICAL PROPERTIES; STOICHIOMETRY; THERMOELECTRICITY; TITANIUM CARBIDES; MECHANICAL PROPERTY; METAL CARBIDE
Downloads: 104
[texts]The effect of the chemical composition of zirconium and niobium carbides in the homogeneity region on their electric and thermal properties (vliyaniye khimicheskogo sostava na electro-i teplofizicheskiye svoystva karbidov tsirkoniya i niobiya v oblas - Avgustinik, A. I.
Chemical composition effect on electric and thermal properties of zirconium and niobium carbides in homogeneity region
Keywords: CHEMICAL COMPOSITION; THERMAL PROPERTY; ZIRCONIUM CARBIDE; ELECTRICAL PROPERTIES; HOMOGENEITY; NIOBIUM CARBIDES; THERMODYNAMIC PROPERTIES; ZIRCONIUM CARBIDES; CHEMICAL COMPOSITION; ELECTRIC PROPERTY; NIOBIUM CARBIDE
Downloads: 11
[texts]Plastic deformation of refractory compounds - Ivanov, A. N.
Plastic deformation effects on refractory titanium carbide, zirconium carbide, titanium boride, and molybdenum silicate
Keywords: MOLYBDENUM; MOLYBDENUM COMPOUND; PLASTIC DEFORMATION; REFRACTORY METAL; TITANIUM BORIDE; TITANIUM CARBIDE; ZIRCONIUM CARBIDE; MOLYBDENUM COMPOUNDS; PLASTIC DEFORMATION; REFRACTORIES; REFRACTORY METALS; SILICATES; TITANIUM BORIDES; TITANIUM CARBIDES; ZIRCONIUM CARBIDES
Downloads: 85
[texts]MECA Workshop on Atmospheric H2O Observations of Earth and Mars. Physical Processes, Measurements and Interpretations - NON
The workshop was held to discuss a variety of questions related to the detection and cycling of atmospheric water. Among the questions addressed were: what factors govern the storage and exchange of water between planetary surfaces and atmospheres; what instruments are best suited for the measurement and mapping of atmospheric water; do regolith sources and sinks of water have uniquely identifiable column abundance signatures; what degree of time and spatial resolution in column abundance data i...
Keywords: ALUMINIDES; TITANIUM CARBIDES; ADDITIVES; GRAVITATIONAL EFFECTS; HEAT RESISTANT ALLOYS; HIGH TEMPERATURE RESEARCH; MICROPOROSITY; REFRACTORY MATERIALS; CERAMICS; COMBUSTION CHEMISTRY; EXOTHERMIC REACTIONS; INTERMETALLICS; MICROSTRUCTURE; NICKEL ALLOYS; SILICON CARBIDES; SYNTHESIS (CHEMISTRY)
Downloads: 74
[texts]The method of space-time and conservation element and solution element: A new approach for solving the Navier-Stokes and Euler equations - Chang, Sin-Chun
A new numerical framework for solving conservation laws is being developed. This new framework differs substantially in both concept and methodology from the well-established methods, i.e., finite difference, finite volume, finite element, and spectral methods. It is conceptually simple and designed to overcome several key limitations of the above traditional methods. A two-level scheme for solving the convection-diffusion equation is constructed and used to illuminate the major differences betw...
Keywords: CALIBRATING; CORRECTION; HEAT TRANSFER; METAL SURFACES; QUARTZ LAMPS; RATIOS; TEMPERATURE MEASUREMENT; WAVELENGTHS; AUTOMATIC CONTROL; TRANSMISSIVITY; PYROMETERS; TUNGSTEN; TUNGSTEN CARBIDES; REFRACTORY MATERIALS; SILICON CARBIDES; SURFACE TEMPERATURE
Downloads: 132
[texts]Propulsion Airframe Integration Test Techniques for Hypersonic Airbreathing Configurations at NASA Langley Research Center - Witte, David W.
The scope and significance of propulsion airframe integration (PAI) for hypersonic airbreathing vehicles is presented through a discussion of the PAI test techniques utilized at NASA Langley Research Center. Four primary types of PAI model tests utilized at NASA Langley for hypersonic airbreathing vehicles are discussed. The four types of PAI test models examined are the forebody/inlet test model, the partial-width/truncated propulsion flowpath test model, the powered exhaust simulation test mod...
Keywords: ALUMINUM ALLOYS; MICROSTRUCTURE; PRECIPITATES; LOW TEMPERATURE TESTS; TENSILE TESTS; MECHANICAL PROPERTIES; SILICON CARBIDES; BORON CARBIDES; REINFORCING MATERIALS; CERMETS; METAL MATRIX COMPOSITES; POWDER METALLURGY; HELIUM; GAS ATOMIZATION
Downloads: 66
[texts]Nimbus and riederen make contact - Francois, Y
No Abstract Available
Keywords: BORON CARBIDES; NITROGEN; STABILITY; TEMPERATURE DEPENDENCE; VACANCIES (CRYSTAL DEFECTS); VACUUM; ELECTRICAL RESISTANCE; HIGH TEMPERATURE; SILICON CARBIDES; STRAIN GAGES; TITANIUM; ZIRCONIUM; ADDITIVES; NITRIDES
Downloads: 59
[texts]Radiative transfer in shrub savanna sites in Niger: Preliminary results from HAPEX-Sahel. Part 1: Modelling surface reflectance using a geometric-optical approach - Franklin, Janet
To use optical remote sensing to monitor land surface-climate interactions over large areas, algorithms must be developed to relate multispectral measurements to key variables controlling the exchange of matter (water, carbon dioxide) and energy between the land surface and the atmosphere. The proportion of the ground covered by vegetation and the interception of photosynthetically active radiation (PAR) by vegetation are examples of two variables related to evapotranspiration and primary produc...
Keywords: ELASTIC DAMPING; THERMODYNAMIC PROPERTIES; MODULUS OF ELASTICITY; BEAMS (SUPPORTS); METAL MATRIX COMPOSITES; VIBRATION MODE; SILICON CARBIDES; ALUMINUM CARBIDES; SHEAR PROPERTIES; STRESS-STRAIN RELATIONSHIPS
Downloads: 66
[texts]Titanium and zirconium carbide coatings on graphite - Burykina, A. L.
Titanium and zirconium carbide protective coatings for graphite - liquid metal soaking followed by graphitization of metallic layer
Keywords: GRAPHITE; LIQUID METAL; PROTECTIVE COATING; TITANIUM CARBIDE; ZIRCONIUM CARBIDE; GRAPHITIZATION; LIQUID METALS; POROSITY; PROTECTIVE COATINGS; SOAKING; TITANIUM CARBIDES; ZIRCONIUM CARBIDES; GRAPHITE
Downloads: 137
[texts]Interaction between carbides of transition metals and their oxides - Fedorus, V. B.
Reactions and interactions studied between oxides and carbides of transition metals
Keywords: CARBIDES; CHEMICAL REACTIONS; MOLECULAR INTERACTIONS; OXIDES; TRANSITION METALS; CHEMICAL REACTION; MOLECULAR INTERACTION; TRANSITION ELEMENT
Downloads: 82
[texts]Interaction of certain refractory carbides with zirconium dioxide (o vzaimodeystvii nekotorykh tugoplavkikh karbidov s dvuokis'yu tsirkoniya) - Avgustinik, A. I.
High temperature research of refractory metal carbide interaction with zirconium dioxide
Keywords: CARBIDES; REFRACTORY METAL; CERMETS; DIOXIDES; HIGH TEMPERATURE RESEARCH; REFRACTORIES; REFRACTORY METALS; ZIRCONIUM; CARBIDE; HIGH TEMPERATURE RESEARCH
Downloads: 57
[texts]Advanced GPS Technology For Automated/Autonomous Shuttle Missions - Goodman, John L
Test flights of a GPS receiver to replace TACAN began in 1996. Each orbiter has one GPS receiver. After RTF, ramp-up to single string GPS use will commence. Endeavour is undergoing TACAN removal and upgrade to three string GPS. GPS is not used for ascent and is powered on prelaunch to support an emergency landing. GPS has limited use for orbital operations and is not used for Rendezvous and docking...
Keywords: MAGNETIC MATERIALS; ENERGY TECHNOLOGY; ENERGY CONVERSION; DIELECTRICS; SPACECRAFT POWER SUPPLIES; SEMICONDUCTOR DIODES; CAPACITORS; TRANSFORMERS; SILICON CARBIDES
Downloads: 89
[texts]Porous material from carbides and borides of transition metals - Kukota, Yu. P.
Porous cermet materials from carbides and borides of transition metals
Keywords: BORIDES; TRANSITION ELEMENT; CARBIDES; CERMETS; POROSITY; POROUS MATERIALS; TRANSITION METALS; BORIDE; CARBIDE; POROUS MATERIAL
Downloads: 59
[texts]Development of a quadrupole-based Secondary-Ion Mass Spectrometry (SIMS) system at Lewis Research Center - Vargas-Aburto, Carlos
The design, construction, and initial use of an ion microprobe to carry out secondary ion mass spectrometry (SIMS) of solid samples is reported. The system is composed of a differentially pumped custom-made UHV (Ultra High Vacuum) chamber, a quadrupole mass spectrometer and a telefocus A-DIDA ion gun with the capability of producing beams of Cesium, as well as inert and reactive gases. The computer control and acquisition of the data were designed and implemented using a personal computer with p...
Keywords: MECHANICAL PROPERTIES; METAL MATRIX COMPOSITES; REACTION KINETICS; SILICON CARBIDES; TITANIUM; HIGH TEMPERATURE; PERFORMANCE PREDICTION; SURFACE LAYERS
Downloads: 85
[texts]Global Silicon Carbide Market By Product Expected To Reach USD 4.49 Billion By 2020 Grand View Research - Grand View Research
Steel and energy were the largest end use application segments for SiC, accounting for 302 kilo tons of total demand in 2013. Increasing demand for steel and energy in emerging markets of India and China, driven by infrastructure development, is expected to be a key factor for demand growth over the forecast period. Silicon carbide is also extensively used in electronics and semiconductors applications, owing to its superior properties, that accounted for over 255 kilo tons of demand in 2013.Mor...
Keywords: #Synthetic minerals; #Diamond simulants; #Carbides; #Market Research; #Semiconductor materials; #Silicon compounds; #Gemstones; #GrandViewResearch
Downloads: 2
[texts]Inventories of Delaware's coastal vegetation and land-use utilizing digital processing of ERTS-1 imagery - Bartlett, D.
The author has identified the following significant results. Analysis of ERTS-1 color composite images using analogy processing equipment confirmed that all the major wetlands plant species were distinguishable at ERTS-1 scale. Furthermore, human alterations of the coastal zone were easily recognized since such alterations typically involve removal of vegetative cover resulting in a change of spectral signature...
Keywords: CARBON; COST EFFECTIVENESS; FUEL CELLS; TUNGSTEN CARBIDES; ELECTRIC POWER SUPPLIES; MAINTENANCE; PERFORMANCE TESTS; STORAGE BATTERIES
Downloads: 77
[texts]Method of fabricating silicon carbide shapes - Enk, E.
Semiconductor silicon carbide formed products using gas containing silicon at high temperature
Keywords: FABRICATION; VAPOR DEPOSITION; HIGH TEMPERATURE; SEMICONDUCTORS (MATERIALS); SHAPES; SILICON; SILICON CARBIDES; VAPOR DEPOSITION; SEMICONDUCTOR; SILICON CARBIDE
Downloads: 95
[texts]NASA Nebraska Space Grant 5 Year Proposal - Bowen, Brent D.
The UNO Aviation Institute Monograph Series began in 1994 as a key component of the education outreach and information transfer missions of the Aviation Institute and the NASA Nebraska Space Grant & EPSCoR Programs. The series is an outlet for aviation materials to be indexed and disseminated through an efficient medium. Publications are welcome in all aspects of aviation. Publication formats may include, but are not limited to, conference proceedings, bibliographies, research reports, manuals, ...
Keywords: SILICON CARBIDES; CERAMIC MATRIX COMPOSITES; BORON NITRIDES; WOVEN COMPOSITES; STRESSES; RUPTURING; FABRICS; DEBONDING (MATERIALS); INTERFACES
Downloads: 77
[texts]Party Line' Information Use Studies and Implications for ATV Datalink Communications - Pritchett, Amy
The perceived importance and utilization of 'party line' information by air carrier flight crews was investigated through pilot surveys and a flight simulation study. The Importance, Availability, and Accuracy of party line information elements were explored through surveys of pilots of several operational types. The survey identified numerous traffic and weather party line information elements which were considered important...
Keywords: ACOUSTIC EMISSION; CERAMIC MATRIX COMPOSITES; MICROCRACKS; ACOUSTIC VELOCITY; SILICON CARBIDES; SHEAR STRESS; WAVEFORMS; STIFFNESS
Downloads: 69
[texts]Large Aperture Systems: 2000-2004 - NON
This custom bibliography from the NASA Scientific and Technical Information Program lists a sampling of records found in the NASA Aeronautics and Space Database. The scope of this topic includes technologies for next generation astronomical telescopes and detectors. This area of focus is one of the enabling technologies as defined by NASA s Report of the President s Commission on Implementation of United States Space Exploration Policy, published in June 2004.
Keywords: ATOMS; VIBRATIONAL STATES; DIFFRACTION; SILICON CARBIDES; NANOCRYSTALS; NANOPARTICLES; NEUTRON DIFFRACTION; SCATTERING; CRYSTAL LATTICES
Downloads: 84
[texts]Survey of decentralized control methods - Athans, M
An overview is presented of the types of problems that are being considered by control theorists in the area of dynamic large scale systems with emphasis on decentralized control strategies. Approaches that deal directly with decentralized decision making for large scale systems are discussed. It is shown that future advances in decentralized system theory are intimately connected with advances in the stochastic control problem with nonclassical information pattern...
Keywords: CARBIDES; FIBERS; METAL MATRIX COMPOSITES; ALUMINUM ALLOYS; GRAPHITE; METAL COATINGS; VAPOR DEPOSITION
Downloads: 72
[texts]Design and development experience with a digital fly-by-wire control system in an F-8C airplane - Deets, D. A
To assess the feasibility of a digital fly by wire system, the mechanical flight control system of an F-8C airplane was replaced with a digital primary system and an analog backup system. The Apollo computer was used as the heart of the primary system. This paper discusses the experience gained during the design and development of the system and relates it to active control systems that are anticipated for future civil transport applications.
Keywords: CARBIDES; SERVICE LIFE; WEAR TESTS; COBALT; DURABILITY; TUNGSTEN ALLOYS; FRICTION; GRAINS; LIQUID NITROGEN; MACHINERY; MECHANICAL DEVICES
Downloads: 134
[texts]Structure of alloys of the Zr-C-Ta system - Avgustinik, A. I.
Structure of zirconium carbon tantalum alloys
Keywords: CARBIDES; CARBON; ISOTHERMS; METALLOGRAPHY; TANTALUM ALLOYS; ZIRCONIUM ALLOYS; CARBIDE; TANTALUM ALLOY; ZIRCONIUM ALLOY
Downloads: 59
[texts]High Energy Particle Acceleration and Turbulent Magnetic Field Amplification in Shell Type Supernova Remnants - Keohane, Jonathan Wilmor
Thesis submitted to the faculty of the Graduate School of the University of Minnesota in partial fulfillment of the requirements for the degree of Doctor of Philosophy. Part I discusses the spatial correlation between the x-ray and radio morphologies of Cas A, and in the process address: the effect of inhomogeneous absorption on the apparent x-ray morphology, the interaction between the SNR and a molecular cloud, and the rapid move toward equipartition between the magnetic and gas energy densiti...
Keywords: TECHNOLOGY ASSESSMENT; SILICON CARBIDES; PROCEDURES; CERAMICS; THICKNESS; MICROSTRUCTURE; HIGH TEMPERATURE; MECHANICAL PROPERTIES
Downloads: 139
[texts]Method and apparatus for adaptive force and position control of manipulators - NON
The present invention discloses systematic methods and apparatus for the design of real time controllers. Real-time control employs adaptive force/position by use of feedforward and feedback controllers, with the feedforward controller being the inverse of the linearized model of robot dynamics and containing only proportional-double-derivative terms is disclosed. The feedback controller, of the proportional-integral-derivative type, ensures that manipulator joints follow reference trajectories ...
Keywords: CARBIDES; COATING; CORROSION RESISTANCE; HEAT RESISTANT ALLOYS; HIGH TEMPERATURE; OXIDATION; OXIDATION RESISTANCE; PATENTS
Downloads: 125
[texts]Contact interaction of metal-like carbides, nitrides and borides with refractory metals at high temperatures (kontaktnoye vzaimodeystviye metallopodobnykh karbidov, nitridov, i boridov s tugoplavkimi metallami pri vysokikh temperaturakh) - Samsonov, G. V.
Interaction of powdered carbides, nitrides, and borides with refractory metals at high temperatures
Keywords: BORIDES; CARBIDES; HIGH TEMPERATURE; NITRIDES; REFRACTORY METALS; BORIDE; CARBIDE; NITRIDE; REFRACTORY METAL
Downloads: 62
[texts]Reanalysis of Clementine Bistatic Radar Data from the Lunar South Pole - Simpson, Richard A.
On 9 April 1994 the Clementine spacecraft high-gain antenna was aimed toward the Moon's surface and the resulting 13-cm wavelength radio echoes were received on Earth. Using these data, we have found that the lunar surface generally follows a Lambertian bistatic scattering function sigma(sub 0) = K(sub D)cos(theta(sub i) with K(sub D) approx. 0.003 for the opposite (expected) sense of circular polarization and K(sub D) approx...
Keywords: LUBRICATION; PATENTS; CRYOGENIC TEMPERATURE; CHROMIUM OXIDES; SILICON CARBIDES; PLASMAS (PHYSICS); COMPOSITE MATERIALS; PARTICULATES; LOW TEMPERATURE; FLUORIDES
Downloads: 67
[texts]Aerodynamic Performance of an Active Flow Control Configuration Using Unstructured-Grid RANS - Joslin, Ronald D.
This research is focused on assessing the value of the Reynolds-Averaged Navier-Stokes (RANS) methodology for active flow control applications. An experimental flow control database exists for a TAU0015 airfoil, which is a modification of a NACA0015 airfoil. The airfoil has discontinuities at the leading edge due to the implementation of a fluidic actuator and aft of mid chord on the upper surface...
Keywords: COATINGS; REINFORCING FIBERS; SILICON CARBIDES; STRESS ANALYSIS; STRESS RELAXATION; COMPRESSION LOADS; HEATING; LASERS; SPECTRAL BANDS
Downloads: 93
[texts]Thermoviscoplastic nonlinear constitutive relationships for structural analysis of high temperature metal matrix composites - Chamis, C. C.
A set of thermoviscoplastic nonlinear constitutive relationships (1VP-NCR) is presented. The set was developed for application to high temperature metal matrix composites (HT-MMC) and is applicable to thermal and mechanical properties. Formulation of the TVP-NCR is based at the micromechanics level. The TVP-NCR are of simple form and readily integrated into nonlinear composite structural analysis. It is shown that the set of TVP-NCR is computationally effective...
Keywords: EARTH ORBITAL ENVIRONMENTS; EXPERIMENTATION; INTERPLANETARY DUST; LOW EARTH ORBITS; OPTICAL PROPERTIES; CARBON; GEOCHEMISTRY; SILICATES; SILICON CARBIDES
Downloads: 76
[texts]A Hardened CARS System Utilized for Temperature Measurements in a Supersonic Combustor - Antcliff, Richard R.
A coherent anti-Stokes Raman scattering (CARS) system has been hardened for use in a NASA Langley supersonic combustion test cell. The system can obtain temperature cross sections of the flow at three locations. The system is environmentally protected and remotely operated. Measurements were made in a scram-jet combustor model consisting of a rear- ward-facing step, followed by an expansion duct. The duct is nominally 4 feet in length...
Keywords: IDENTIFYING; SILICON CARBIDES; MATERIALS; MATERIALS SELECTION; HIGH TEMPERATURE; CREEP RUPTURE STRENGTH; MELTING POINTS; THERMAL CONDUCTIVITY
Downloads: 57
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